Hemodynamic changes in anxious depression adolescents during a verbal fluency task: A fNIRS study

Area of Science:

• Neuroscience
• Adolescent Psychiatry
• Cognitive Neuroscience

Background:

• Anxious depression in adolescents is associated with more severe impairments than depression alone.
• Understanding the neurobiological underpinnings of varying anxiety levels in depressed adolescents is crucial for targeted interventions.

Purpose of the Study:

• To investigate differences in brain activity patterns, specifically oxyhemoglobin (Oxy-Hb) changes, during a cognitive task in depressed adolescents with varying anxiety levels.
• To explore the relationship between anxiety severity and prefrontal cortex (PFC) activation in adolescent depression.

Main Methods:

• Functional near-infrared spectroscopy (fNIRS) was used to measure Oxy-Hb changes in 196 depressed adolescents.
• Participants were categorized into low anxious depression (LAD), moderate anxious depression (MAD), and high anxious depression (HAD) groups.
• The verbal fluency task (VFT) was employed to assess cognitive function and associated brain activity.

Main Results:

• Adolescents with HAD exhibited significantly lower Oxy-Hb activation in Brodmann Areas 10 (BA 10) and 46 (BA 46) compared to LAD.
• Anxiety scores (HAM-A) were negatively correlated with Oxy-Hb levels in BA 10 and BA 46.
• LAD group showed higher activation in BA 10 and BA 46 during the VFT's initiation and maintenance phases compared to HAD and MAD groups.

Conclusions:

• Adolescents with high anxious depression demonstrate reduced prefrontal cortex (PFC) activation (BA 10, BA 46), indicating impaired attention control.
• These findings provide neurophysiological evidence for anxiety's detrimental effect on cognitive function in depressed youth.
• The results may inform personalized interventions, including non-invasive brain stimulation (NIBS), for adolescents with varying anxiety levels.